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A. E. GOLGATB. PHoToemaPHIer CAMERA.

No. 437,290. Patented Sept. 30, 1890.

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A. E. GOLGATB.'

PHOTOGRAPHIG CAMERA.

(No Model.)

No. 437,290. Patented Sept. 30. 1890.

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UNITED STATES PATENT OFFICE.

ARTHUR E. OOLGATE, OF NEXT YORK, N. Y., ASSIGNOR TO F. G. OTTO da SONS, OF SAME PLACE.

PHOTOGRAPHIC CAMERA.

SPECIFICATION forming part of Letters Patent No. 437,290,'dated September 80, 1890.

Application filed April 2 5 l 890.

To all whom it may concern:

Be it known that I, ARTHUR E. COLGATE, a resident of the city of New York, in the county and State of New York, have invented an Improvement in Photographic Cameras, of which the following is a specification.

My invention relates to an improved attachment for a photographic camera whereby pictures can be taken by the instantaneous process, which camera will be described in a subsequent part of this specification, reference being had to the accompanying drawings, forming part thereof, in which- Figure l represents a central vertical section of my improved camera on the line c c of Fig. 2. Fig. 2 represents a cross-section of my camera on the lines lo k of Fig. l. Fig. 3 represents a sectional view of my lens barrel or tube on the lines k lo of Fig. 2. Fig. 4 represents a top view, partly in section, of the camera, the line c indicating the planelof section. Fig. 5 represents an enlarged front view of the shutters at the instant of exposure.

My camera consists of the usual box A, having the perforatedface-plate c, and means for retaining the sensitive plate-holder c.

Inside the camera and conveniently near the face-plate is a partition D, bearing a tube g, into which slides the lens-tube h. To the front of the partition D are pivoted at ione or two shutters E, each having curved arm or upper part These shutters F. are adapted to be forced apart and together by means of the guide-pins jj or analogous projection on the slide F, assisted, if desired, by springs?l Z. The said guide-pinsjj are securely attached to a sliding carrier F, to which is secured a bar G, projecting through the bottom of the box and having a suitable handle at itslower end. Around this bar between the bottom of the box and the lower portion of the sliding carrier a spiral spring m may be placed to assist in the lifting of said carrier. To the upper end of the said sliding carrier F is attached a strong spiral spring H, which enters a recess Il of aprojection D of the faceplate D. A thumb-screw H2 may be used to regulate the strength of said springl The sliding carrier runs between two rails D2 D3 on the partition D, or is otherwise guided, and is or may be held from slipping out from Serial No. 349,414. (No model.)

between them by the buttons S. (Shown in Fig. 5.) On one side of the sliding carrier is a catch n, which by a spring o is forced into a hole or recess of the slide F when down. The catch n connects with a rod p, which is adapted to release the sliding carrier by forcing the catch n out of the hole in the side of the said slidingcarrier. 'A strip I of suitable light-excluding 'material' may be stretched across the opening behind the shutters E E, as shown, being perforated in line with the lens. It serves as a support for the shutters and helps to make them overlap tightly, so that when closed no streak of lightrmay enter between them.

It has heretofore been customary to employ a rack attached to the sliding barrel bearing the lens, but such rack has been for its entire length attached to the barrel, and a slit cut large enough to allow the teeth to project and gear with the cog-wheel, thus al lowing light to penetrate the dark chamber oi' the camera. I obviate this difficulty as follows: To the inner end of the lens-barrel 7i I secure a hook-shaped rack q, whose main portion runs parallel to the said lens-barrel h and outside the tube g. For further pro tection the lens'barrel 7L is wound with thread or other suitable material h', thus forming a light-tight joint. The hook-shaped rack c1 lies parallel with the outer side of the tube g and is adapted to gear with a cog-wheel r on a shaft tu, which projects through the box, and to which is attached a graduated scale t. A iixed pointer u, secured to the top of the box, registers with the said scale t.

Having now described the mechanical part of my invention, I will describe its operation. The lens-tube is adjusted to the proper distance, and the sliding carrier F is pulled down, as in Fig. 2, until the catch n enters the hole in the said sliding carrier. In this position the shutters E E are held together, as in Fig. 2, and the spring I-I is strained or the spring m contracted, or both. The sensitive plate being in position, I press the button p against the catch n, which disengages the sliding carrier F and allows the spring H to pull or the spring m to push the slide F upward. In doing this the guide-buttons j j', bearing against the curved arms of the IOO shutters E, first spread. such shutters apart, as in Fig. 5,'an'd, continuing-to,ascendrclose them again, thus forming an instantaneous exposure. If the pinsj j enter slots in the shutters, the springs Z Z may be dispensed with.

The advantages of my invention areV cheap construction, eectiveoperation, the ease with which it can be adapted to any camera, and

the further fact that, the shutters when` openv being separated farther at their lowermost point than at their top, I am enabled to expose the-foreground a longer time thanthe sky, and thereby obtain a better picture.

By the hook-shaped rack'q, Iamen-abled-to connect the pinion 7' with the sliding tubeh with-out requiring Va slot in the tube gfthroughv which-lightmight enter.-

Havii1,. 3; now` described myv invention, what 1. In=a;.photographic camera, the 'combination ofl the pivoted shutter, E, having curved armwith the slidingl carrier F, guide-but ton: j, .andfmeans, 1substantially as described,

i fory raisin gl and lowering the said slidingcarrier-asand'for the purpose set forth'.

2: The combinationoff'the shutters-E,hav.- Y'

ingcurvedarms fr, with :the sliding carrierF,

guide-buttons jj, andlmeans, substantially as A described, for lowering said sliding carrier, and with the catclvnJ andlifting-springH, as specified.

3. The combination of the shutters E, having curved arms with the sliding carrier F,

`guide-buttons jj, springs Z l, and means, sub- `stantially as described, for lowering said sliding-carrier, and with the catch n and liftingspring H, as specified.

4. The partition D, carrying the opening andclosing shutters E E, and the fixed tube g, combined with the movable lens-tube h,

.hookfshaped'rack q, and pinion r, substantially as herein shown and described.

5; The fixed tube g, combined with the movable lens-tube h, Vand `with Athe hookshaped rack q, .carried by saidzlens-tube, and

with means, substantiallyV as;- described., for

movingsaidn'ack, as:specifiedA 6. Thecombination of` the shutters'EE-{and means-, substantially as described, forI opening and closing the same, with `the perforatedstrip Ilot light-excluding material stretched behind them, substantially as'herein shownand described.

ARTHUR E. GOLGATE';`

Witnesses: A

HARRY M. TURK, LIvINGs'roNfEMERY. I 

